Well, I'm no expert, but I was always under the impression that you could replace graphics cards with a laptop, since they can go bad over time..... but I guess I was wrong, lol. Oh well.
But I am concerned with this issue, considering I am a college student and I am poor enough as it is, and I CAN NOT afford to get a new machine. This laptop was a graduation present from my parents, which I got it in July of 2009, and the guy that sold it to us did not inform us of any bugs that could occur after a long period of time with the machine. I am also questioning the method they used to diagnose my flickering issues. Watching a video for 5 hours on my machine? If they did that, it would have flickered. I have noticed it flickers when I have a video playing on youtube, or if I'm on a site with a lot of flash...
What disturbs me is that Apple hasn't given us a permanent solution to this problem. I love Macs over PCs, and I don't plan on converting back anytime soon. I just want a machine that I don't have to worry about every night...